EP1070552B1 - Verfahren zum Beschichten von Eisen- und Stahluntergründen - Google Patents
Verfahren zum Beschichten von Eisen- und Stahluntergründen Download PDFInfo
- Publication number
- EP1070552B1 EP1070552B1 EP00114504A EP00114504A EP1070552B1 EP 1070552 B1 EP1070552 B1 EP 1070552B1 EP 00114504 A EP00114504 A EP 00114504A EP 00114504 A EP00114504 A EP 00114504A EP 1070552 B1 EP1070552 B1 EP 1070552B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- process according
- coat
- coating
- fix
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/586—No clear coat specified each layer being cured, at least partially, separately
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
Definitions
- the invention relates to a method for coating the surfaces of Workpieces made of iron and steel and using such a method coated objects.
- a layer of a highly weather-resistant polyester or Polyurethane powder applied As a single layer or in the case of a multilayer structure as a top layer preferably a layer of a highly weather-resistant polyester or Polyurethane powder applied. Powder coatings on this basis are in almost lightfast and UV stabilized version available and lend the coated article has a high weather resistance.
- EP-A-0 030 762 describes the application of a base layer made of zinc / epoxy resin and a cover layer made of synthetic resin to a surface to be protected.
- the object of the invention was therefore to provide a coating system for iron and To create steel parts that are primarily high Corrosion protection requirements of German railways and road construction are not is only fair at the moment but also withstands long-term.
- the goal was, among other things, to obtain corrosion protection, that of galvanizing at least equals without their disadvantages such as outgassing, zinc flowers, to have to accept rough surfaces etc.
- the aim was furthermore a visually appealing and decorative surface that the designers and enables architects to create elegant steel structures in one to design an appealing shade.
- the surface should be in its Structure to be improved so far that they have a powder coating Aluminum equals.
- polyester or polyurethane powder is additionally used an intermediate layer of pure between these two layers Epoxy resin powder provided.
- An epoxy powder is used for this intermediate layer, which forms a Layer with high pore tightness leads.
- the Pore tightness of this pure epoxy resin layer causes moisture and liquid or liquid pollutants are very difficult to Diffuse underground and can damage the steel, which by the Mixing layer of zinc powder and epoxy resin not to the same extent is guaranteed. This is particularly important in the area of elevated Pollution such as road salt attacks and sea air influences.
- the basic property of the epoxy resin ensures a extraordinarily high chemical resistance and gives an additional Guarantee that aggressive media will not penetrate the coating and Destroy underground.
- the pure epoxy resin layer also forms a microscopically rough and matt Surface that is a very good, adhesive surface for the subsequent Represents top layer of polyester or polyurethane powder.
- the powder is preferably applied to the workpiece conventional way by spraying the powder in the electrostatic field instead of.
- the production of the surface, which is as clean as possible, as a substrate is usually done by blasting, especially sandblasting. in this connection a surface roughness of 40-80 ⁇ m should be achieved. A such roughening improves the adhesion of zinc powder and Epoxy resin base layer. Roughness depths of more than 80 ⁇ m are too avoid, because otherwise the metal tips, which result from the sandblasting, can no longer be covered by the zinc powder.
- Sandblasting should be carried out according to SA 3, DIN 55928, Part 4, rust removal sharp-edged grain made to the surface of oxides, scale, rust etc. to free. Applying the base layer of zinc powder and Epoxy resin should be applied immediately after sandblasting so that prepared surface area not disadvantageous again in the meantime Undergoes changes.
- Epoxy resin is used, which has a relatively high zinc content, namely one Contains 60-85 wt .-%. This high proportion is appropriate to the cathodic protection achieved by hot-dip galvanizing if possible come close. As with a conventional galvanizing, this Layer of steel cathodically protected in the event of surface damage. The good adhesion of the epoxy resin to the steel prevents this Infiltration of the coating by foreign substances. The microscopic rough and matte surface of the powder provides an excellent primer for the subsequent intermediate layer made of pure epoxy powder.
- the thickness of the thermally treated base layer should be in the range of 30-200 ⁇ m. This layer thickness specification also applies in the same way to the intermediate layer made of pure epoxy powder.
- the thickness of the highly weather-resistant top layer made of polyester or polyurethane powder is preferably chosen somewhat higher than that of the basic and Interlayer. It is preferably between 45 and 300 ⁇ m after thermal treatment.
- the top layer is intended to cover the entire system Protect weather influences. The top layer can, depending on requirements, with different optical effects are generated. Almost every color and any surface character is possible here.
- the thermal treatment of the workpiece to fix the individual Powder layers take place between about 150 ° C and 250 ° C.
- the thermal treatment is expediently in a hot air chamber performed.
- the workpiece must always be the specified one Reach temperatures.
- a pure surface heating of the applied Powder layer may not be enough to fix it properly.
- the duration of each thermal treatment can be up to 60 minutes.
- the finished coating preferably has an overall thickness in the range of 100-700 ⁇ m.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Paints Or Removers (AREA)
- Compounds Of Iron (AREA)
Description
Claims (10)
- Verfahren zum Beschichten der Oberflächen von Werkstücken aus Eisen oder Stahl mit den folgenden Verfahrensschritten:a) Herstellen einer metallisch möglichst reinen Oberfläche,b) Aufbringen einer Grundschicht aus einer Mischung eines Zinkpulvers und eines thermisch aushärtbaren Epoxy-Pulvers und thermische Behandlung des Werkstückes zum Fixieren der Grundschicht,c) Aufbringen einer Zwischenschicht eines thermisch aushärtbaren Epoxy-Pulvers und thermische Behandlung des Werkstückes zum Fixieren der Zwischenschicht, sowied) Aufbringen einer Deckschicht eines Pulvers aus thermisch aushärtbarem Beschichtungsmaterial, insbesondere auf der Basis von Polyester oder Polyurethan, und thermische Behandlung des Werkstückes zum Fixieren der Deckschicht.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Werkstücke elektrostatisch mit dem jeweiligen Pulver beschichtet werden.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Herstellen der metallisch möglichst reinen Oberfläche mittels Sandstrahlen erfolgt.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das Sandstrahlen auf eine Rauhtiefe von 40-80 µm vorgenommen wird.
- Verfahren nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß das Sandstrahlen nach SA3, DIN 55928, Teil 4, Entrostung, mit scharfkantigem Korn erfolgt.
- Verfahren nach mindestens einem der Ansprüche 1-5, dadurch gekennzeichnet, daß für die Grundschicht eine Mischung aus Zinkpulver und Epoxidharzpulver verwendet wird, die 60-85 Gew.-% Zinkpulver enthält.
- Verfahren nach mindestens einem der Ansprüche 1-6, dadurch gekennzeichnet, daß die Grundschicht mit einer Enddicke von 30-200 µm erzeugt wird.
- Verfahren nach mindestens einem der Ansprüche 1-7, dadurch gekennzeichnet, daß die Zwischenschicht aus Epoxidharz mit einer Enddicke von 30-200 µm erzeugt wird.
- Verfahren nach mindestens einem der Ansprüche 1-8, dadurch gekennzeichnet, daß die Deckschicht mit einer Enddicke von 45-300 µm erzeugt wird.
- Verfahren nach mindestens einem der Ansprüche 1-9, dadurch gekennzeichnet, daß die thermischen Behandlungen des Werkstückes zum Fixieren der einzelnen Schichten bis zu 60 min bei 150-250°C erfolgen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19933698 | 1999-07-17 | ||
DE19933698A DE19933698A1 (de) | 1999-07-17 | 1999-07-17 | Verfahren zum Beschichten von Eisen- und Stahluntergründen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1070552A1 EP1070552A1 (de) | 2001-01-24 |
EP1070552B1 true EP1070552B1 (de) | 2002-10-16 |
Family
ID=7915223
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00114504A Expired - Lifetime EP1070552B1 (de) | 1999-07-17 | 2000-07-06 | Verfahren zum Beschichten von Eisen- und Stahluntergründen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1070552B1 (de) |
AT (1) | ATE226116T1 (de) |
DE (2) | DE19933698A1 (de) |
ES (1) | ES2185532T3 (de) |
PT (1) | PT1070552E (de) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2353701C3 (de) * | 1973-10-26 | 1982-01-07 | Inmont GmbH, 5300 Bonn | Zinkstaubprimersystem für verformbares Stahlblech |
NL171333C (nl) * | 1975-10-14 | 1983-03-16 | Akzo Nv | Werkwijze voor het onder water bekleden van metaaloppervlakken. |
FR2452327A1 (fr) * | 1979-03-29 | 1980-10-24 | Cauwenberghe Helic Van | Procede d'application d'un revetement anticorrosif sur des objets metalliques, notamment sur des bouteilles de gaz liquefie |
NL7909016A (nl) * | 1979-12-14 | 1981-07-16 | Akzo Nv | Werkwijze voor het aanbrengen van een corrosiewerend 2-lagen systeem op staal. |
DE3531370A1 (de) * | 1985-09-03 | 1987-03-05 | Iris Lacke Baumann Gmbh | Lacksystem fuer eine korrosions- und schlagfeste lackierung |
-
1999
- 1999-07-17 DE DE19933698A patent/DE19933698A1/de not_active Withdrawn
-
2000
- 2000-07-06 DE DE50000635T patent/DE50000635D1/de not_active Expired - Lifetime
- 2000-07-06 ES ES00114504T patent/ES2185532T3/es not_active Expired - Lifetime
- 2000-07-06 EP EP00114504A patent/EP1070552B1/de not_active Expired - Lifetime
- 2000-07-06 PT PT00114504T patent/PT1070552E/pt unknown
- 2000-07-06 AT AT00114504T patent/ATE226116T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
PT1070552E (pt) | 2003-03-31 |
DE50000635D1 (de) | 2002-11-21 |
EP1070552A1 (de) | 2001-01-24 |
DE19933698A1 (de) | 2001-01-18 |
ATE226116T1 (de) | 2002-11-15 |
ES2185532T3 (es) | 2003-05-01 |
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